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Pi Day-March 14! Pi=3.14159265358979323... ﻿2.7 trillion known digits, but it has an infinite number of digits

Who first discovered pi? Where did they do it and when?

Good question! The Babylonians used to find the area of circles using 3 times the radius squared, putting pi at around three. Archimedes of Syracuse used similar polygons to put the value of pi between 3 1/7 and 3 10/71. Later, Zu Chongzhi, a Chinese mathematician and astrono calculated the ratio of the value of the circumference of a circle to the diameter of the same circle to be about 355/113, which is accurate up to six decimal places. The well-known symbol for pi was introduced by William Jones in 1706 and was popularized by Leonhard Euler in 1737. In the eighteenth century, a French mathematician named Georges Buffon found a way to calculatem pi based on probability.

Pi Day-March 14! Pi is an irrational number, meaning it goes on forever and cannot be turned into a fraction. Pi is the same throughout the whole world, it's not different when you go to another place!

﻿That's so cool! Who knew that people used pi so long ago!﻿

﻿What can pi be used for?

﻿﻿There are lots of uses for pi, but in our class, we just use it for the area and circumference of circles. Also, remember that even though we often use 3.14 as pi in our calculations, pi is an irrational number. It never ends and it cannot be turned into a fraction, and it does not have any repeating pattern throughout the number. Pi is the ratio of a circle's circumference to its diameter, putting it at c/d, and it never changes no matter what numbers are plugged into the formula. Oh, the bell just rang, class is over! Happy pi day everyone, no homework!

﻿Thanks for the super cool and educational lesson about the history, value, and uses of pi today! I'll remember that throughout all of my math classes.